MicroSD card Classes / Grades

Post MicroSD Card classes – what we need to know

SD cards are rated by class (not just MicroSD) though it is not mandatory for manufacturers to include this information on SD cards. It is mandatory on SD/SDHC cards however (which includes many MicroSD cards).

Basically, the classification system lets you know the guaranteed minimum operating speed of a SD/SDHC card. The classes are 2, 4 and 6 (as of now), though Samsung just announced a product which would qualify as a hypothetical Class 8.

A Class 2 means a card with a speed of 2 MB/s or higher is guaranteed at the best fragmented state where no memory unit is occupied.
A Class 4 means a card with a speed of 4 MB/s or higher is guaranteed at the best fragmented state where no memory unit is occupied.
A Class 6 means a card with a speed of 6 MB/s or higher is guaranteed at the best fragmented state where no memory unit is occupied.

Be sure that you know what the requirements of the device that you will be using this card with before making a purchase. Many GPS units and phones which use SD cards will say for example, that a card with a Class rating of 4 or better is required…



Comments

comments

Leave a Reply